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JPWO2016059764

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DESCRIPTION JPWO2016059764
Abstract A loudspeaker includes a frame, a diaphragm, an edge connection, a magnetic circuit
having a magnetic gap, and a voice coil body. The edge connection portion connects the outer
peripheral end of the diaphragm to the frame. The diaphragm is disposed inside the frame. The
diaphragm has a flat diaphragm and a reinforcing diaphragm. Both the front and back surfaces of
the flat diaphragm are flat. The reinforced diaphragm includes a thick portion and a recess and is
coupled to the flat diaphragm. And a reinforcement diaphragm is formed by resin. The thick
portion is formed on the outer periphery of the reinforcing diaphragm. The recess is provided on
the center side of the reinforcing diaphragm.
Loudspeaker and mobile unit equipped with loudspeaker
[0001]
The present disclosure relates to a loudspeaker using a flat diaphragm used in an audio device,
and a mobile device equipped with the loudspeaker.
[0002]
Loudspeakers require various forms depending on the application.
For example, in-vehicle loudspeakers installed in car dashboards and ceilings such as cars are
required to be particularly thin.
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1
[0003]
In order to reduce the thickness of the loudspeaker, generally, the thickness of the diaphragm is
reduced, the bobbin around which the voice coil is wound is shortened in the direction of the
winding axis of the voice coil, and the magnetic circuit is further reduced. And so on. Therefore, it
is difficult for a thin loudspeaker to secure the rigidity of the diaphragm and to secure the sound
pressure level of the sound output from the loudspeaker.
[0004]
As prior art document information related to the invention of this application, for example,
Patent Documents 1 and 2 are known.
[0005]
JP-A-56-56095 JP-A-2011-35812
[0006]
A loudspeaker according to the present disclosure includes a frame, a diaphragm, an edge
connection, a magnetic circuit having a magnetic gap, and a voice coil body.
The edge connection portion connects the outer peripheral end of the diaphragm to the frame.
The first end of the voice coil body is disposed in the magnetic gap. On the other hand, the
second end of the voice coil body is coupled to the center of the diaphragm.
[0007]
The diaphragm is disposed inside the frame. The diaphragm has a flat diaphragm and a
reinforcing diaphragm. Both the front and back surfaces of the flat diaphragm are flat. The
reinforced diaphragm includes a thick portion and a recess and is coupled to the flat diaphragm.
And a reinforcement diaphragm is formed by resin. The thick portion is formed on the outer
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periphery of the reinforcing diaphragm. The recess is provided on the center side of the
reinforcing diaphragm.
[0008]
The magnetic circuit is fixed to the frame. The magnetic circuit is disposed at a position facing
the recess.
[0009]
As described above, in the loudspeaker of the present disclosure, the central portion of the
diaphragm has the recess. And the magnetic circuit is arrange | positioned in the position facing
the recessed part. Thus, the loudspeaker can be made thinner. Further, since the diaphragm has a
reinforced diaphragm having a thick portion, the rigidity of the diaphragm is high. On the other
hand, the reinforcing diaphragm has a recess on the center side, and the weight of the diaphragm
can be reduced, so that the sound pressure level of the diaphragm can be increased.
[0010]
FIG. 1 is a perspective view of a loudspeaker according to an embodiment. FIG. 2 is a plan view of
the loudspeaker according to the embodiment. FIG. 3 is a cross-sectional view of a loudspeaker
according to an embodiment. FIG. 4: is a principal part expanded sectional view of the magnetic
gap part in the loudspeaker of embodiment. FIG. 5 is an enlarged sectional view of an essential
part of the diaphragm according to the embodiment. FIG. 6 is a rear view of the loudspeaker
according to the embodiment. FIG. 7 is an enlarged sectional view of an essential part of a
diaphragm according to a modification of the embodiment. FIG. 8 is a conceptual view of a
mobile device according to the embodiment.
[0011]
The strength of the flat diaphragm in conventional loudspeakers is weak. Therefore, the
thickness of the flat diaphragm has to be increased, and there is a problem that the loudspeaker
can not be thinned.
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[0012]
Thus, the present disclosure solves such a problem, and provides a thin loudspeaker with good
sound pressure level and distortion.
[0013]
Hereinafter, embodiments of the present disclosure will be described.
[0014]
(Embodiment) Loudspeakers require various forms depending on applications.
The in-vehicle loudspeakers are installed, for example, in a narrow space such as a car
dashboard, a door or a ceiling.
Therefore, the in-vehicle loudspeakers installed at such places are required to be thin. Therefore,
the thin loudspeaker 51 according to the present embodiment will be described below with
reference to FIGS. 1 to 6. FIG. 1 is a perspective view of the loudspeaker 51. FIG. FIG. 2 is a plan
view of the loudspeaker 51. As shown in FIG. FIG. 3 is a cross-sectional view of loudspeaker 51
taken along line 3--3 of FIG.
[0015]
As shown in FIG. 3, the loudspeaker 51 includes a frame 52, an edge connection portion 53, a
magnetic circuit 54 having a magnetic gap 54 A, a voice coil body 55, and a diaphragm 61. The
edge connection portion 53 connects the outer peripheral end of the diaphragm 61 and the
frame 52. The first end of the voice coil body 55 is disposed in the magnetic gap 54A. On the
other hand, the second end of the voice coil body 55 is coupled to the central portion of the
diaphragm 61. The magnetic circuit 54 is fixed to the frame 52. The diaphragm 61 is disposed
inside the frame 52. Here, the magnetic circuit includes, for example, a magnet and a magnetic
body surrounding the magnet, and the flow of magnetic flux from the magnet forms a circuit.
And what provided the spatial clearance in the circuit is a magnetic gap. Therefore, in the
magnetic gap, a magnetic flux exists in the spatial gap. In the present disclosure, the magnetic
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circuit 54 includes, for example, a bottom plate 71, a yoke 72, a magnet 73, and a top plate 74,
and is spatially provided between the inner surface of the yoke 72 and the outer peripheral side
of the top plate 74. Is the magnetic gap 54A.
[0016]
FIG. 5 is an enlarged sectional view of an essential part of the diaphragm 61. As shown in FIG.
The diaphragm 61 has a flat diaphragm 62, a reinforcing material layer 63, and a reinforcing
diaphragm 64. The front and rear surfaces of the flat diaphragm 62 are both flat. The reinforcing
material layer 63 is formed on the front surface and the rear surface of the flat diaphragm 62.
The reinforcing diaphragm 64 is coupled to the flat diaphragm 62 via the reinforcing material
layer 63.
[0017]
The reinforcing diaphragm 64 includes a thick portion 64A and a recess 64B. The thick portion
64A is formed on the outer periphery of the reinforcing diaphragm 64. The recess 64B is formed
on the center side of the reinforcing diaphragm 64 with respect to the thick portion 64A. Since
the reinforcing diaphragm 64 is provided on the rear surface side of the flat diaphragm 62, the
recess 64 B is formed in a region including the center of the rear surface of the diaphragm 61.
The reinforcing diaphragm 64 is preferably made of resin.
[0018]
As shown in FIG. 3, the magnetic circuit 54 is disposed at a position facing the recess 64B.
Thereby, since the magnetic circuit 54 and the diaphragm 61 can be disposed close to each
other, the distance between the upper surface of the magnetic circuit 54 and the front surface of
the diaphragm 61 can be reduced. Therefore, the thickness of the loudspeaker 51 can be
reduced. Further, the concave portion 64 B is formed in a region including the center of the
diaphragm 61, and the thick portion 64 A is formed in the outer peripheral portion of the
diaphragm 61. Therefore, even if the thickness of the central portion of the diaphragm 61 is thin,
the mechanical strength of the diaphragm 61 can be increased. As a result, the diaphragm 61 can
be lightened, and the sound pressure level of the diaphragm 61 can be increased.
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[0019]
Next, the loudspeaker 51 will be described in more detail. As shown in FIG. 1, the frame 52 has a
main body 52A. The main body 52A has a hollow cylindrical shape. In the case of a circular
diaphragm 61 when viewed from the front, the main body 52A preferably has a cylindrical
shape.
[0020]
As shown in FIG. 3, the frame 52 has an outer surface and an inner surface. Further, the frame
52 has an attachment portion 52C on the inner side surface of the frame 52. The edge
connection 53 is coupled to the attachment 52C. The loudspeaker 51 has an air gap 52 B
between the side surface of the outer peripheral portion of the diaphragm 61 and the inner
surface of the frame 52.
[0021]
The loudspeaker 51 may further include a terminal 56. In this case, the terminals 56 pass
through the inner side surface and the outer side surface of the frame 52. By this configuration,
one of the terminals 56 is disposed in the air gap 52B. Furthermore, the loudspeaker 51
preferably comprises a trunk line 57. The relay line 57 electrically connects the terminal 56 and
the voice coil 55A.
[0022]
The relay wire 57 preferably penetrates the reinforcing diaphragm 64 and is pulled out from the
side surface of the outer peripheral portion of the reinforcing diaphragm 64. The relay wire 57
drawn from the side surface of the outer peripheral portion of the reinforcing diaphragm 64 is
wired toward the terminal 56 in the air gap 52B and is electrically connected to the terminal 56.
With this configuration, the loudspeaker 51 can reduce the space in which the relay wire 57 is
disposed on the rear surface side of the diaphragm 61. Therefore, the loudspeaker 51 can be
thinned. It is more preferable that the relay wire 57 be drawn from the side surface of the outer
periphery of the thick portion 64A. With this configuration, the loudspeaker 51 can be thinned.
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[0023]
The shape of the edge connection portion 53 as viewed from the front is annular as shown in
FIG. As shown in FIG. 3, the edge connection portion 53 preferably includes a first edge
connection portion 53A and a second edge connection portion 53B. The first edge connection
portion 53A and the second edge connection portion 53B connect the outer peripheral end of the
diaphragm 61 and the frame 52 together. The second edge connection portion 53B is preferably
disposed on the opposite side of the first edge connection portion 53A with respect to the center
in the thickness direction of the side surface of the outer periphery of the diaphragm 61.
Preferably, the terminal 56 is disposed at a position between the first edge connection portion
53A and the second edge connection portion 53B in the thickness direction of the diaphragm 61.
Furthermore, it is preferable that the relay wire 57 be drawn out from the side surface of the
outer peripheral portion of the diaphragm 61. With this configuration, the loudspeaker 51 can be
thinned.
[0024]
Outer peripheral end portions of the first edge connection portion 53A and the second edge
connection portion 53B are bonded to the mounting portion 52C. Therefore, the attachment
portion 52C protrudes from the inner circumferential surface of the frame 52. Further, the
mounting portion 52C has a first mounting surface 52D and a second mounting surface 52E. The
first mounting surface 52D and the second mounting surface 52E stand perpendicularly to the
inner surface of the frame 52. The first edge connection portion 53A is connected to the first
attachment surface 52D. On the other hand, the second edge connection portion 53B is
connected to the second attachment surface 52E.
[0025]
Furthermore, it is preferable that the inner peripheral end of the first edge connection part 53A
be connected to the front surface of the diaphragm 61, and the inner peripheral end of the
second edge connection part 53B be connected to the rear surface of the thick part 64A. By this
configuration, the distance between the first edge connection 53A and the second edge
connection 53B can be increased. Therefore, contact of the edge connection portion 53 with the
terminal 56 can be suppressed. Further, the occurrence of rolling of the diaphragm 61 can also
be suppressed.
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[0026]
It is preferable that the first edge connection portion 53A and the second edge connection
portion 53B be symmetrical with respect to a plane perpendicular to the winding axis direction
of the voice coil 55A shown in FIG. This configuration improves the distortion characteristics of
the diaphragm 61. In addition, it is not restricted to the structure which has both the 1st edge
connection part 53A and the 2nd edge connection part 53B, the structure which provided only
any one of the 1st edge connection part 53A or the 2nd edge connection part 53B may be
sufficient. .
[0027]
FIG. 4 is an enlarged sectional view of an essential part in the vicinity of the magnetic gap 54A in
the loudspeaker 51. As shown in FIG. The voice coil body 55 has a voice coil 55A. The voice coil
55A may have a bobbin 55B. In this case, the voice coil 55A is wound around the bobbin 55B.
The voice coil body 55 is not limited to the configuration including the bobbin 55B, and may be
configured by only the voice coil 55A.
[0028]
The magnetic circuit 54 is, for example, an internal magnet type. The magnetic circuit 54
preferably includes a bottom plate 71, a yoke 72, a magnet 73, and a top plate 74. The magnet
73 is mounted on the top surface of the bottom plate 71 and magnetically coupled to the bottom
plate 71. Further, the top plate 74 is mounted on the top surface of the magnet 73 and
magnetically coupled to the magnet 73. The yoke 72 is provided on the outer periphery of the
bottom plate 71. The yoke 72 stands from the lower surface of the magnetic circuit 54 toward
the upper surface. The inner peripheral surface of the yoke 72 is disposed to face the side
surface of the outer periphery of the top plate 74. A magnetic gap 54A is provided between the
inner surface of the yoke 72 and the side surface of the outer periphery of the top plate 74.
[0029]
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Preferably, the tapered portion 72A is formed on the side surface of the outer periphery of the
yoke 72. In this case, it is preferable to provide the inclined portion 64E on the side surface of
the inner periphery of the reinforcing diaphragm 64. The inclined portion 64E is disposed to face
the tapered portion 72A. With this configuration, since the magnetic circuit 54 and the
diaphragm 61 can be disposed close to each other, the loudspeaker 51 can be thinned. The
magnetic circuit 54 is not limited to the inner magnet type, and may be an outer magnet type, or
a combination of an inner magnet type and an outer magnet type.
[0030]
FIG. 6 is a rear view of the loudspeaker 51. As shown in FIG. The bottom plate 71 preferably
includes a connecting portion 71A. The connecting portion 71A extends in the outer peripheral
direction from the portion of the bottom plate 71 where the magnet 73 is installed. The distal
end of the connecting portion 71A is coupled to the frame 52. With this configuration, the
magnetic circuit 54 is coupled to the frame 52 via the coupling portion 71A.
[0031]
The yoke 72 and the bottom plate 71 may be integrally formed. That is, the yoke 72 is formed by
bending from the end of the outer periphery of the bottom plate 71. In this case, it is preferable
that the connecting portion 71A be configured of parts different from the portion of the bottom
plate 71 where the magnet 73 is installed.
[0032]
Furthermore, it is preferable that the connecting portion 71A be formed of a nonmagnetic
material. With this configuration, it is possible to suppress the magnetic flux of the magnetic
circuit 54 from leaking to the connecting portion 71A. Further, it is preferable that the
connecting portion 71A be formed of a material having a high thermal conductivity. Connecting
portion 71A can be formed of, for example, aluminum or copper. With this configuration, the
heat generated by the magnetic circuit 54 can be dissipated from the connecting portion 71A.
[0033]
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The flat diaphragm 62 and the reinforcing diaphragm 64 shown in FIG. 5 are preferably formed
of a foamed resin material. With this configuration, since the diaphragm 61 can be lightened, the
response characteristics of the diaphragm 61 can be improved. Therefore, the rising of the sound
output from the diaphragm 61 is quick. Further, since the sound pressure level of the sound
output from the diaphragm 61 can be improved, the diaphragm 61 can increase the limit
reproduction frequency in the high region. The flat diaphragm 62 and the reinforcing diaphragm
64 are preferably made of a hard foamed resin material. With this configuration, the sound speed
of the diaphragm 61 and the sound pressure level can be increased. The plane vibration plate 62
is not limited to the configuration formed of a foamable resin, and may be a vibration plate of a
honeycomb structure made of paper, metal or the like. Alternatively, the flat diaphragm 62 may
be formed of a non-foamable resin.
[0034]
The flat diaphragm 62 preferably includes the reinforcing material layer 63. Preferably, the
reinforcing material layer 63 has a first reinforcing material layer 63A provided on the rear
surface of the flat diaphragm 62. In this case, the reinforcing diaphragm 64 is coupled to the first
reinforcing material layer 63A. That is, in the outer peripheral portion of the diaphragm 61, the
first reinforcing material layer 63A is sandwiched between the reinforcing diaphragm 64 and the
flat diaphragm 62.
[0035]
With this configuration, the planar diaphragm 62 has the first reinforcing material layer 63A, so
the rigidity of the planar diaphragm 62 is high. Therefore, since the weight of the flat diaphragm
62 can be reduced, the sound pressure level of the diaphragm 61 can be increased.
[0036]
Furthermore, since the first reinforcing material layer 63A is bonded to a flat surface, the
generation of wrinkles and the like in the first reinforcing material layer 63A can be suppressed.
Therefore, the generation of a gap between the first reinforcing material layer 63A and the
reinforcing diaphragm 64 can be suppressed. As a result, since generation of unnecessary
resonance of the diaphragm 61 can be suppressed, generation of peaks and dips in the frequency
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characteristics of the diaphragm 61 can be suppressed. Further, it can be suppressed that the
reinforcing diaphragm 64 is disposed to be inclined with respect to the rear surface of the flat
diaphragm 62. Therefore, the occurrence of the rolling of the diaphragm 61 can be suppressed.
As a result, the voice coil 55A shown in FIG. 4 can be prevented from hitting the magnetic circuit
54. Moreover, distortion of the sound output from the diaphragm 61 shown in FIG. 3 can be
reduced.
[0037]
The reinforcing material layer 63 may further include a second reinforcing material layer 63B.
The second reinforcing material layer 63B is formed opposite to the first reinforcing material
layer 63A in the flat diaphragm 62. That is, the second reinforcing material layer 63 </ b> B is
formed on the front surface of the flat diaphragm 62. With this configuration, the strength of the
diaphragm 61 can be further improved. The reinforcing material layer 63 is preferably formed of
a hard and light material. With this configuration, the sound speed of the diaphragm 61 and the
sound pressure level can be increased. The reinforcing material layer 63 can use, for example,
carbon or metal. The material of the metal reinforcing material layer 63 may be, for example,
aluminum or titanium.
[0038]
The recess 64 </ b> B may have a hole (through hole) provided through the reinforcing
diaphragm 64. In this case, the first reinforcing material layer 63A is exposed in the through hole
of the recess 64B. Therefore, the reinforcing diaphragm 64 preferably includes the first
insulating portion 64C at the bottom of the recess 64B. The first insulating portion 64C is
disposed between the relay wire 57 and the first reinforcing material layer 63A. In this case, as
shown in FIG. 3 and FIG. 4, the voice coil body 55 is coupled to the first insulating portion 64C.
With this configuration, electrical short circuit between the first reinforcing material layer 63A
and the relay wire 57 can be suppressed.
[0039]
Furthermore, it is preferable that the first insulating portion 64C be integrally formed of the
same material as the thick portion 64A. In this case, the recess 64B preferably has a bottom
formed by the first insulating portion 64C. That is, the first reinforcing material layer 63A is
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covered with the first insulating portion 64C and is not exposed at the bottom of the recess 64B
in which the first insulating portion 64C is formed. With this configuration, even when the relay
wire 57 vibrates, the occurrence of an electrical short between the relay wire 57 and the first
reinforcing material layer 63A can be prevented. Further, separately, there is no need to
interpose the first insulating portion 64C between the relay wire 57 and the first reinforcing
material layer 63A.
[0040]
The first insulating portion 64C and the thick portion 64A are not limited to the integrally
formed configuration, and may be configured as separate parts. In this case, for example, an
insulating tape with an adhesive applied on both sides can be used for the first insulating portion
64C. Alternatively, the first insulating portion 64C may be an insulating tube.
[0041]
Moreover, it is preferable that the thickness of the 1st insulation part 64C is uniform. With this
configuration, it is possible to suppress that the center of gravity of the diaphragm 61 is disposed
offset from the winding axis of the voice coil 55A. Therefore, distortion of the sound output from
the diaphragm 61 can be reduced.
[0042]
Furthermore, as shown in FIG. 5, the thick portion 64A preferably includes a second insulating
portion 64D. Since the thick portion 64A is formed on the outer periphery of the reinforcing
diaphragm 64, the thick portion 64A is annular. Therefore, the through hole 58 is provided so as
to penetrate between the inner peripheral side surface of the thick portion 64A forming the side
surface of the concave portion 64B and the outer peripheral side surface of the thick portion
64A. The relay wire 57 shown in FIG. 3 is inserted into the through hole 58. By this
configuration, the second insulating portion 64D is formed between the through hole 58 and the
first reinforcing material layer 63A in the thick portion 64A. Therefore, electrical short circuit
between relay wire 57 and first reinforcing material layer 63A can be suppressed.
[0043]
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The relay wire 57 shown in FIG. 3 is not limited to the configuration in which it is inserted into
the through hole 58, and may be insert-molded when the reinforcing diaphragm 64 is formed.
With this configuration, the operation of inserting the relay line 57 shown in FIG. 3 into the
through hole 58 is unnecessary.
[0044]
FIG. 7 is an enlarged sectional view of an essential part of a diaphragm 81 according to a
modification of the present embodiment. The diaphragm 81 includes a reinforced diaphragm 84
in place of the reinforced diaphragm 64 of the diaphragm 61. The reinforcing diaphragm 84
includes a thick portion 84A and a second insulating portion 84D. The second insulating portion
84D and the thick portion 84A are configured by separate parts. The second insulating portion
84D is disposed between the first reinforcing material layer 63A and the thick portion 84A.
[0045]
The reinforcing diaphragm 84 may include the first insulating portion 64C. In this case, the first
insulating portion 64C and the second insulating portion 84D are integrally formed of the same
material. The outer diameter of the second insulating portion 84D is preferably the same as that
of the flat diaphragm 62, and the diameter of the outer periphery of the second insulating
portion 84D is preferably the same as the diameter of the flat diaphragm 62.
[0046]
A groove 85 is provided at the junction of the second insulating portion 84D and the thick
portion 84A. The relay line 57 shown in FIG. 3 is wired along the groove 85. Although the groove
85 is provided in the thick portion 84A, the invention is not limited to this configuration, and the
groove 85 may be provided only in the second insulating portion 84D or in both the second
insulating portion 84D and the thick portion 84A. With this configuration, with the relay wire 57
shown in FIG. 3 wired along the groove 85, the relay wire 57 shown in FIG. 3 is reinforced by
bonding the second insulating portion 84D and the thick portion 84A. It can be configured to
penetrate 84. Therefore, the operation of passing the relay wire 57 through the through hole can
be omitted. Further, when applying an adhesive to the bonding portion between the second
11-05-2019
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insulating portion 84D and the thick portion 84A, it is preferable to apply the adhesive to the
groove 85 at the same time. With this configuration, the operation of applying the adhesive to
the groove 85 can be made unnecessary. As a result, the number of assembly steps of the
diaphragm 81 can be reduced. The other configurations in the present modification are the same
as those in the present embodiment.
[0047]
Next, a method of assembling the loudspeaker 51 will be described with reference to FIG. The
assembling method of the loudspeaker 51 includes the steps of manufacturing the frame 52,
manufacturing the assembly of the magnetic circuit 54, manufacturing the voice coil body 55,
and manufacturing the assembly of the flat diaphragm 62. Connecting the diaphragm 61 to the
frame 52; coupling the assembly of the magnetic circuit 54 to the frame 52; and fabricating the
assembly of the reinforced diaphragm 64.
[0048]
In the process of producing the frame 52, the resin frame 52 is produced by injection molding or
the like. The terminal 56 is preferably insert-molded when the frame 52 is manufactured.
[0049]
In the process of producing the assembly of the magnetic circuit 54, the magnet 73 and the yoke
72 are bonded onto the bottom plate 71 by an adhesive or the like. Further, the top plate 74 is
bonded onto the magnet 73 by an adhesive or the like. A magnetic gap 54A of a prescribed size
is provided between the side surface of the outer periphery of the top plate 74 and the side
surface of the inner periphery of the yoke 72.
[0050]
In the step of producing the voice coil body 55, the wire is wound to produce the voice coil 55A.
When the voice coil body 55 includes the bobbin 55B, the voice coil 55A is wired on the side
surface of the outer periphery of the bobbin 55B.
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[0051]
A method of making an assembly of planar diaphragm 62 will be described with reference to
FIGS. 5 and 3. In the process of manufacturing the assembly of the flat diaphragm 62, the first
reinforcing material layer 63A is attached to the rear surface of the flat diaphragm 62. When the
second reinforcing material layer 63B is included, the second reinforcing material layer 63B is
attached to the front surface of the flat diaphragm 62. Furthermore, the inner peripheral portion
of the first edge connection portion 53A is attached to the flat diaphragm 62 or the second
reinforcing material layer 63B.
[0052]
In the process of manufacturing the assembly of the reinforced diaphragm 64 shown in FIG. 3,
the inner peripheral portion of the second edge connection portion 53B is attached to the thick
portion 64A. Although the first reinforcing material layer 63A shown in FIG. 5 is attached in the
process of producing the assembly of the flat diaphragm 62, the present invention is not limited
to this configuration, but in the process of producing the assembly of the reinforced diaphragm
64. You may paste it. In this case, the first reinforcing material layer 63A is attached to the front
side of the reinforcing diaphragm 64. In the process of manufacturing the assembly of the
reinforced diaphragm 64, it is preferable to wire the relay wire 57 in the through hole 58.
[0053]
The assembly of the reinforced diaphragm 84 shown in FIG. 7 is manufactured in the same
manner as the assembly of the reinforced diaphragm 64. That is, in the case where the thick
portion 84A and the second insulating portion 84D are formed by separate parts, in the step of
producing the assembly of the reinforced diaphragm 84, the thick portion 84A and the second
insulating portion 84D are bonded. It is bound by the agent etc. An adhesive may be applied to
the bonding portion between the thick portion 84A and the second insulating portion 84D and
the groove 85. In this case, the relay wire 57 shown in FIG. 3 is wired to the groove 85 before
bonding the thick portion 84A and the second insulating portion 84D. With this configuration,
the operation of bonding the relay wire 57 and the reinforcing diaphragm 84 separately shown
in FIG. 3 is unnecessary.
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[0054]
In the step of connecting the diaphragm 61 shown in FIG. 3 to the frame 52, the assembly of the
flat diaphragm 62 and the assembly of the reinforcing diaphragm 64 are bonded to the frame
52. That is, the outer peripheral portion of the first edge connection portion 53A is coupled to
the first attachment surface 52D. Further, the outer peripheral portion of the second edge
connection portion 53B is coupled to the second mounting surface 52E. With this configuration,
it is possible to manufacture the diaphragm 61 in which the first reinforcing material layer 63A
is sandwiched between the planar diaphragm 62 and the reinforcing diaphragm 64.
Furthermore, the assembly of the flat diaphragm 62 and the reinforcing diaphragm 64 are
bonded.
[0055]
As shown in FIG. 5, in the diaphragm 61, the flat diaphragm 62 and the reinforcing diaphragm
64 are configured as separate parts. Further, as shown in FIG. 7, in the diaphragm 81, the flat
diaphragm 62 and the reinforcing diaphragm 84 are configured as separate parts. Therefore, as
shown in FIG. 3, the assembly of the flat diaphragm 62 can be mounted from the front side of the
frame 52. On the other hand, the assembly of the reinforcing diaphragm 64 and the reinforcing
diaphragm 84 can be mounted from the rear surface side of the frame 52. Furthermore, bonding
of the assembly of the flat diaphragm 62 to the frame 52 and bonding of the assembly of the flat
diaphragm 62 to the reinforcing diaphragm 64 or the reinforcing diaphragm 84 can be
simultaneously performed. At this time, the assembly of the reinforcing diaphragm 64 or the
reinforcing diaphragm 84 and the frame 52 may be simultaneously bonded. Therefore, the
number of steps for connecting the diaphragm 61 to the frame 52 can be reduced.
[0056]
The assembly of the flat diaphragm 62 is preferably attached to the frame 52 later than the
assembly of the reinforcing diaphragm 64. Since the front surface of the frame 52 is open before
the assembly of the flat diaphragm 62 is attached to the frame 52, the relay wire 57 and the
terminal 56 can be easily connected.
[0057]
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Furthermore, in the step of coupling the diaphragm 61 to the frame 52, the voice coil body 55 is
preferably coupled to the diaphragm 61. In this case, the voice coil body 55 is disposed at a
prescribed position before the assembly of the flat diaphragm 62 is attached to the frame 52.
With this configuration, the relay wire 57 and the voice coil 55A can be easily connected. Then,
after connecting the relay wire 57 and the voice coil 55A, the assembly of the voice coil body 55
and the flat diaphragm 62 is bonded. In this case, when bonding the voice coil body 55 and the
assembly of the plane vibration plate 62, it is also possible to simultaneously bond the outer
peripheral portion of the first edge connection portion 53A and the first attachment surface 52D.
[0058]
After the step of coupling the diaphragm 61 to the frame 52, the loudspeaker 51 is completed by
coupling the assembly of the magnetic circuit 54 to the frame 52.
[0059]
As described above, the flat diaphragm 62 and the reinforcing diaphragm 64 are manufactured
as separate parts, and the diaphragm 61 is formed by joining them.
Alternatively, the flat diaphragm 62 and the reinforcing diaphragm 84 are manufactured as
separate parts, and the diaphragm 81 is formed by joining them. Therefore, the terminal 56 is
disposed in the air gap 52B provided between the first edge connection portion 53A, the second
edge connection portion 53B, the inner side surface of the frame 52, and the side surface of the
outer periphery of the diaphragm 61 Also, the terminal 56 and the voice coil 55A can be easily
connected.
[0060]
Although the assembly of the flat diaphragm 62 is attached to the frame 52 later than the
assembly of the reinforcing diaphragm 64, the present invention is not limited thereto, and the
assembly of the flat diaphragm 62 is attached to the frame 52 before the assembly of the
reinforcing diaphragm 64. You may
[0061]
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Further, when the assembly of the flat diaphragm 62 is manufactured, the voice coil body 55
may be coupled to the flat diaphragm 62.
In this case, the assembly of the flat diaphragm 62 is preferably mounted to the frame 52 prior
to the assembly of the reinforcing diaphragm 84. Furthermore, in this case, the second insulating
portion 84D shown in FIG. 7 is preferably attached to the assembly of the flat diaphragm 62
when the assembly of the flat diaphragm 62 is manufactured. With this configuration, the
terminal 56 is disposed in the air gap 52B provided between the first edge connection portion
53A, the second edge connection portion 53B, the inner side surface of the frame 52, and the
side surface of the outer periphery of the diaphragm 61. Even if it does, it can connect easily
between terminal 56 and voice coil 55A.
[0062]
FIG. 8 is a conceptual view of a mobile device 201 equipped with the loudspeaker 51 according
to the embodiment of the present invention. The mobile device 201 is, for example, an
automobile, but is not limited thereto, and may be a ship, an aircraft, a train, a motorcycle, or the
like.
[0063]
The mobile device 201 includes a main body portion 202, a drive portion 203, an amplification
portion 211, and a loudspeaker 51. The drive unit 203, the amplification unit 211 and the
loudspeaker 51 are mounted on the main body unit 202. The drive unit 203 may include an
engine, a motor, a tire, a steering wheel, and the like. The output of the amplification unit 211 is
supplied to the loudspeaker 51. The amplifier unit 211 may constitute part of a car audio. In that
case, the amplification unit 211 may include a reproduction device of a sound source.
Furthermore, the amplification unit 211 may constitute part of a car navigation system. In that
case, the amplification unit 211 may include a display device and the like.
[0064]
11-05-2019
18
In the case where the main body portion 202 includes the boarding space 202A, the loudspeaker
51 is installed to be able to emit sound to the boarding space 202A. In this case, the main body
portion 202 may further include an exterior portion 202B and an interior portion 202C. The
exterior portion 202B isolates the passenger space 202A from the outside. The exterior portion
202B is, for example, a roof 202D or a door 202E. The interior portion 202C is provided
between the exterior portion 202B and the boarding space 202A. The loudspeaker 51 is housed
between the interior part 202C and the exterior part 202B. The place where the loudspeaker 51
is installed is not limited to the above, and may be a dashboard or a rear tray.
[0065]
With the above configuration, since the loudspeaker 51 is thin, the distance between the interior
202C and the exterior 202B can be reduced. As described above, if the loudspeaker 51 is
mounted on the mobile device 201, the riding space 202A can be expanded.
[0066]
The embodiment described above is for facilitating the understanding of the present invention,
and the material and shape of each component constituting the loudspeaker 51 described in the
embodiment can be changed variously, and the present invention It is not for the purpose of
limiting interpretation.
[0067]
Further, the present invention can be changed and improved without departing from the gist
thereof, and the present invention also includes the equivalents thereof.
[0068]
The loudspeaker according to the present invention has the effect of being able to be made thin,
and is particularly useful for in-vehicle audio equipment and household audio equipment.
[0069]
51 Loudspeaker 52 Frame 52A Body 52B Air Gap 52C Mounting Part 52D First Mounting
Surface 52E Second Mounting Surface 53 Edge Connection 53A First Edge Connection 53B
Second Edge Connection 54A Magnetic Gap 54 Magnetic Circuit 55 Voice Coil 55A Voice coil
55B bobbin 56 terminal 57 relay wire 58 through hole 61 diaphragm 62 plane diaphragm 63
reinforcing material layer 63A first reinforcing material layer 63B second reinforcing material
11-05-2019
19
layer 64 reinforcing diaphragm 64A thick portion 64B concave portion 64C first insulating
portion 64D second insulating portion 64E inclined portion 71 bottom plate 71A connecting
portion 72 yoke 72A tapered portion 73 magnet 74 top plate 81 diaphragm 84 reinforcing
diaphragm 84A thick portion 84D second insulating portion 85 groove 201 moving body device
202 main body portion 202A Boarding space 202B exterior 202C interior 202D roof 202E door
203 driver 211 amplifying section
11-05-2019
20
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